Spark plug



0d- 8, 1929- w. J. DAuBl-:NsPEcK 1,730,561

SPARK PLUG Filed Dec. 250,v 1925 NvENToR BY f Patented Oct. *8, 1929UNITEDl STATES PATENT- OFFICE WILLIAM J. DAUIBENSPECK, OF CLEVELAND,OHIO, ASS-IGNOR TO THE IGNITION MANU- FACTUBING COMPANY, OF CLEVELAND,OHIO, A CORPORATION 0F OHIO SPARK PLUG Application led December 30,1925. Serial No. 78,382.

This invention relates to improvements in spark plugs and moreparticularly to means for admitting cleansing and cooling air to theelectrode insulator, electrodes and other spark plugparts exposed tocombustion, preventing accumulation of carbon and other fouling matterthereon, causing burning and cracking of the electrode insulator withresulting short circuiting of the electric current along the fouled andburned parts.

Another object is to provide means for admitting cleansing and coolingair adaptable to a spark plug of any standard size. Motor cylinder headsare usually designed with a minimum of clearance for standard sizedspark plugs and wrench, and for this reason oversized spark plugs areundesirable.

Other objects and features of my invention will be describedhereinafter.

Referring to the drawings, Fig. 1 is a sectional view showing a form ofmy invention;

Fig. 2 is a plan view thereof witli''rts re-` moved; Fig. 3 is a detailview of the form of valve shown in Fig. 1; Figs. 4 and 5 are views ofmodified forms thereof; Fig. 6 is a sectional view showing a furtherformof my invention; Fig. 7 is a plan view thereof with parts removed.

Fig. 1 shows a form of spark plug and valve in which the metallic bodyis formed of two sections 29 and 30 screw threaded t0- gether as at 31and pinned at 32. Annuler rccessed shoulder 33 of body section 30provides a stop for the toes 35 of valves 34 seating in air inlets 36provided in body section 29. Shoulder 33 also deflects the cleansing andcooling air against porcelain 36. The porcelain 36 is secured in thebody section 29 by a nut 11. The stems 37 of the valves 34 are spacedfrom the Walls of the air inlets 21, yso that when the valves are intheir open position, as shown in Figure 1, air can pass in through thespaces around the stems 37 and by the valve portions 34 into the annularrecess 44 disposed adjacently above the shoulder 33 and adjacent themeeting edges of the plug sections 29 and 30. It will `be noted that thewalls of the air openings 21 are formed adjacent their inner ends intoseats 45 for the'valve portions proper 34. The

porcelain 36 is extended through the plug sections 29 and 30 in spacedrelation to the inner walls thereof to form the annular chamber 15through which the air passes from the recess 44. Figs. 4 and 5 showmodifications of this form of valve.

Fig. 6 shows another modified form of spark plug in which the metallicbody is formed of sections 38and 39 threaded together as at 40 andpinned at 41. In this form the electrode porcelain 42 is inserted andsecured by annular nut 43 at the'bottom side of body section 38. Also,the valves proper 46 are formed with stems 47 disposed within annularcages 20 and in spaced relation tothe walls of said cages, the latterbeing pressfitted into the tops of openings 48 formed in the upper plugsection 38, the lower portions 14 of said openings being of restricteddiameter and communicating with an annular recess 49 termed adjacent themeeting edges of the plug sections 38 and 39. The inner ends of thecages 20 form seats 51 for the valve heads 46 and the oining walls 50 ofthe plug section 38 intermediate the bottom of the cages 20 and therestricted air inlets 14 serve, in combination with the valve seats 51,to confine the valve heads 46, but permit a-limited reciprocatorymovement of the valves. In order to permit passage of air by the valveheads 46, when the latter are in their open position, transversechannels 52 are formed in the inner faces of the valve heads 46 whichcommunicate with the space between the valve heads and thejoining'walls50and with the constricted air channels 14.

- While I have shown different-embodiments of my invention for thepurpose of clear disclosure cert-ain minor changes in structuralconstricted, the joining wall of the inner and outer opening portionsforming means, in conjunction with sa1d valve seat, for confining' avalve head, a valve stem contained in said outer opening portion inspaced relation to the wall thereof and formed with a head membercontained between said valve seat and said joining wall, the valve beingadapted to open inwardly `a limited amount until stopped by said joiningwall, and means per,-

.K mitting the passage of air by said valve head and joining wall intothe inner portion of said air opening, when the valve head is removedfrom its seat. 2. A spark plugr comprising inner an outer tubularsections secured together and forming an annular recess adjacent theirmeeting edges, said outer section having an air opening communicatingwith said recess, avalve Seat inasaid opening, a freely reciprocatablevalve having a valve head adapted in its closed position to cont-acttightly with said seat and having a valve stem itting loosely intheouter portion of said air opening, and a stop provided on the sparkplug for limiting the opening movement of the valve head. 3. ln a sparkplug of the class described, a tubular outer section having an airopening communicating with its hollow interior, said opening having aninner constrictedfportion,

a valve cage fitted in the outer portion of said opening and providedwith a valve seat at its inner end, a valve having a valve head looselyconfined between said valve seat and said inner constricted portion andhaving a valve stem tting loosely in the valve cage, and meanspermitting the passage of air by the valve head into the innerconstricted portion of the air opening when the valve is in its fullyopen position.,

4f. ln a spark plug of the class described, a,

tubular outer section having an air opening communicating with itshollow interior, said opening being provided with a valve seat, a

opening, a stop provided on said element for limiting the openingmovement 'of the valve head, said valve head in its extreme open adaptedin its closed position to contact tightly with said seat and beingadapted in its open position to seat on thestop, and means permittingthe passage of air by the valve into-the hollow interior of thechambered body when the valve is seated on the stop.

7. A chambered body comprising a tubular element having an air openingcommunicating with its hollow interior, a valve seat in said opening, astop adjacent said valve seat, a valve freely reciprocatable betweensaid seat and said stop, said valve being'adapted in its closed positionto contact tightly with said seat and being adapted in its open positionto seat on the stop, a valve stem on said valve extending looselythrough the outer portion of said air opening and slightly above theouter surface of said tubular element, and

means permitting the passage of air by the valve into the hollowinterior of the chambered body when the valve is seated on the stop.

ln testimony whereof, l do ax my signature.l

WILLEAM d. DAUBENSPECK.

freely reciprocatable valve having a valve f head adapted in its closedposition to Contact tightly with said seat and having a 'valve stemfitting loosely in the outer portion of said air opening, and a stoplimiting the opening movement of said valve head.

5. A tubular spark plug element comprising a section having anairopening communicating with the hollow interior of said element, avalve seat in said opening, a freely reciprocatable valve having a valvehead adapted in its closed position to Contact tightly with said seatand having a valve stem litting loosely in the outer portion of said air

